This helicopter is a twin-engine, tandem-rotor aircraft that was a variant of the Boeing Vertol CH-46 Sea Knight built by the U.S.
The Labrador was a search and rescue helicopter purchased by the RCAF (Royal Canadian Air Force), used between 1963-2004. In Canada, the CH-46 was also renamed as the CH-113 Labrador.
The image above taken from Wikipedia (photographed by Adam Hunt) shows the 301 (as per the CH11301), at the Canada Aviation and Space Museum in Ottawa. The 301 was the first of the Labrador’s put in service, and the last one taken out of service.
Eventually, the Canadian Army wanted a version of their own… a troop and cargo carrier designated as the Voyageur.
The Voyageur was replaced by the Army in and around 1975 by the CH-147 Chinook heavy-lift and transport choppers, with the remaining Voyageurs moved to the RCAF.
The Voyageurs and Labradors performed search and rescue duties.